8

1140 Chapter 9: Sur face Modeling
Curve sub-object selection controls
Single Cur ve—Clicking or transforming a curve
selects only a single independent curve sub-object.
All Connected Cur ves —Clicking or transforming
a curve selects all curve sub-objects that are
connected within the NURBS object. To be
connected, two curves must have fused points,
or one curve must be a connected dependent (a
blend, fillet, or chamfer) of the other.
Name—Shows the name of the currently selected
curve. It is disabled if you have selected multiple
cur ves.
By default, the name is t he name of the curve
type ("CV Curve" or "Point Curve") followed by a
sequence number. You can use this field to give the
curve a name that you choose.
Hide—Click to hide the c urrently selected curves.
Unhide All—Click to unh ide a ll hidden curves.
Hide by Na me—Click to display a Select
Sub-Objects dialog t hat l ists curves by nam e.
Selec t the curves to hide, then click Hide.
Unhide by Na me—Disabled unless there are hidden
curves. Click to display a Select Sub-Objects
dialog that lists curves by name. Select the curves
to make visible, then click Unhide.
Delete—Deletes the selected curve sub-objects.
Mak e Fit—Tur ns a CV c ur ve into a p oint cur ve.
This displays the
Make P oint Curve dialog (page
1–1237)
, which lets you set the number of points.
Forapointcurve,thisbuttonletsyouchangethe
number of points in the curve.
Reverse—Reverses the order of the CVs or points
in a curve, s o that the first vertex becomes the last,
and the last becomes the first.
The first point or CV is significant when you use
theNURBScurvelikeaspline:asa
loft (page
1–347)
path or shape, as a path constraint (page
2–380)
path, or as a motion trajectory (page
2–296)
. For these purposes, the first vertex of the
curve is sig nificant. If the cur ve is a closed curve,
you can use Make First to set the curve’s first
vertex.
The direction of the curve also determines the
initial direction of normals on surfaces based on
this curve.
Mak e COS—This button is enabled only for the
following kinds of curves:
•
U iso cur ves (page 1–1170)
• V iso cur ves (page 1–1170)
• Normal projected cur ves (page 1–1171)
• Vector projected curves (page 1–1172)
• Surface-surface intersection cur ves (page
1–1167)
• Surface edge curves (page 1–1178)
• CV curves on surfaces (page 1–1174)
• Point c urves on surfaces (page 1–1176)
This displays a Make Curve on Surface dialog
(page 1–1228)
, which turns the selected curve
int o a CV or point curve on surface. Once
converted, you can edit the new curve on
surfaceusingthecurveonsurfacecontrols,
including the
Edit Curve on Surface dialog
(page 1–1230)
.
If the curve is already a curve on surface, this
button lets you change it from a point to CV
curve on sur face, or vice versa.
ThenewCurveonSurfacepreservesthe
trimming of the original curve.